diff --git a/lib/linguist/blob_helper.rb b/lib/linguist/blob_helper.rb
index 5d030232..00c3e3a1 100644
--- a/lib/linguist/blob_helper.rb
+++ b/lib/linguist/blob_helper.rb
@@ -3,6 +3,7 @@ require 'linguist/mime'
 require 'linguist/pathname'
 
 require 'escape_utils'
+require 'yaml'
 
 module Linguist
   module BlobHelper
@@ -65,6 +66,13 @@ module Linguist
       ['.xib', '.nib', '.pbxproj'].include?(pathname.extname)
     end
 
+    vendored_paths = YAML.load_file(File.expand_path("../vendor.yml", __FILE__))
+    VendoredRegexp = Regexp.new(vendored_paths.join('|'))
+
+    def vendored?
+      name =~ VendoredRegexp
+    end
+
     # Determine if the blob contains bad content that can be used for various
     # cross site attacks. Right now this is limited to flash files -- the flash
     # plugin ignores the response content type and treats any URL as flash
diff --git a/lib/linguist/vendor.yml b/lib/linguist/vendor.yml
new file mode 100644
index 00000000..b32bb1f6
--- /dev/null
+++ b/lib/linguist/vendor.yml
@@ -0,0 +1,27 @@
+- yui
+- tiny_mce
+- ckeditor
+- redbox
+- active_scaffold
+- rico_corner
+- code_highlighter
+- vendor
+- bundle
+- node_modules
+- cache
+- assets
+- bookends
+- dojo
+- extjs
+- sencha
+- mochikit
+- prototype(.*)\.js
+- mootools\.js
+- jquery([^.]*)(\.min)?\.js
+- jquery\-\d\.\d\.\d(\.min)?\.js
+- effects\.js
+- controls\.js
+- dragdrop\.js
+- fabfile\.py
+- less([^.]*)(\.min)?\.js
+- less\-\d+\.\d+\.\d+(\.min)?\.js
diff --git a/test/test_blob.rb b/test/test_blob.rb
index 76129c0b..d8f7cc5a 100644
--- a/test/test_blob.rb
+++ b/test/test_blob.rb
@@ -114,6 +114,19 @@ class TestBlob < Test::Unit::TestCase
     assert blob("project.pbxproj").generated?
   end
 
+  def test_vendored
+    assert !blob("README").vendored?
+
+    assert blob("node_modules/coffee-script/lib/coffee-script.js").vendored?
+    assert blob("vendor/plugins/will_paginate/lib/will_paginate.rb").vendored?
+
+    assert blob("public/javascripts/jquery.js").vendored?
+    assert blob("public/javascripts/prototype.js").vendored?
+    assert blob("public/javascripts/effects.js").vendored?
+    assert blob("public/javascripts/controls.js").vendored?
+    assert blob("public/javascripts/dragdrop.js").vendored?
+  end
+
   def test_language
     assert_equal Language['Ruby'], blob("foo.rb").language
     assert_equal Language['Ruby'], blob("script.rb").language